These last days I'm trying different new Linux Mint distros via Live USBs. I create them with usb-creator-gtk (the Startup Disk Creator). They work fine but there is no countdown on them. And the message "Automatic boot in 10 seconds" doesn't have effect, because if I wait 10 seconds (or more) the boot doesn't happen even without a countdown. The easy and quick workaround is to press the Enter key twice to boot the Live USBs "manually".

I've checked the syslinux.cfg file (inside the syslinux folder) and I have:

This way the automatic boot works and we can stop it pressing any key. And we can choose any option to be executed.

I have deleted the "Integrity check" option because it doesn't work, at least here. I have also removed the "Boot from local drive" option because here, instead of doing that, it boots from the USB flash drive itself. I have added a second memory test avaiable.

Does anybody know how to add to this proposed syslinux.cfg file the possibility of showing the splash.jpg image?

I think that these problems happen because the .iso files are designed specially for DVDs, not for USB flash drives.

Well, after checking a bit more, perhaps it's more correct to say that the "Integrity check" works but, because the iso images are specially made to be burnt into DVDs, when you run it on a Live USB you get 4 errors because it looks for 4 files inside the isolinux folder, when actually they are inside the syslinux directory.